PTH and hypoparathyroidism: The data we derived on the risk of hypocalcemia can be cross-referenced with those of other studies assessing the risk of hypoparathyroidism after thyroidectomy, considering the roles of early PTH measurement 4 hours after thyroidectomy [33] and of measurement of corrected serum calcium and PTH on the first postoperative day as predictors of safe discharge [7].